Fix syntax error in converse.pot

src/i18n/converse.pot

@@ -6,8 +6,7 @@
 #, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: Converse.js 11.0.0
-"
+"Project-Id-Version: Converse.js 11.0.0\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2025-05-20 15:35+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"